Update doco version
Submodule GitExtensionsDoc updated

Submodule GitExtensionsDoc:
    > e14e900 - Set version to 2.48
    > c57ace3 - Version updated to 2.47
    > 2dd49d2 - Correction as per comment to PR#43.
    > 563780a - Commit font
    > 37e2e43 - Add new setting to Advanced->Confirmations